`expandHerm`

expands the Herm list in SexPars to a matrix of fractions at age

`checkHerm`

checks that each array in the list has dimension nsim x maxage+1 x nyears + proyears. For backwards compatibility, also converts matrices to arrays by adding the year dimension.

`subsetHerm`

returns year-specific Herm values.

## Usage

```
expandHerm(Herm, maxage, np, nsim)
checkHerm(Herm, maxage, nsim, nyears, proyears)
subsetHerm(Herm, y)
```